Hello,
No doubt both colleges are good but after comparing both the institutes, following results are obtained-

• IIT Tirupati do not offer ECE engineering course.
  
• For IIT Tirupati, to clear JEE advance is must.
• In NIT Andhra pradesh students is to faculty ratio is 148:1 where as in IIT Tirupati Students is to Faculty ratio is 37:1 which means students will get more chance in IIT to clear their doubts.
• Both colleges have good opportunities to learn and better placements.

Student can take admission in any of two only the difference is of distribution of students in a batch.
Good Luck.